CN111393580B

CN111393580B - Polyarylethersulfone composite material and preparation method thereof

Info

Publication number: CN111393580B
Application number: CN202010256576.XA
Authority: CN
Inventors: 张东宝; 于冉; 张奇; 张建民
Original assignee: Ningxia Qingyan Polymer New Material Co ltd
Current assignee: Ningxia Qingyan Polymer New Material Co ltd
Priority date: 2020-04-02
Filing date: 2020-04-02
Publication date: 2022-12-13
Anticipated expiration: 2040-04-02
Also published as: CN111393580A

Abstract

The invention discloses a composite material of polyarylethersulfone and a preparation method thereof, and the composite polyarylethersulfone with high water absorption and good mechanical property is obtained by optimizing the proportion of each segment group in the composite material. The structure is as follows, formed by interpenetrating networks of fragments of structure I and structure II. I.C. A

II

Description

Polyarylethersulfone composite material and preparation method thereof

Technical Field

The invention belongs to the field of high polymer materials, and particularly relates to a novel polyarylethersulfone composite material and a preparation method thereof.

Background

Polyarylethersulfones (PAES) are a class of polymeric materials containing aryl, sulfone, ether structures, which generally have excellent mechanical properties, heat resistance and better hydrolysis resistance. The modified proton exchange material has wide application in proton exchange material, such as proton exchange in fuel cell field.

The common protonation modification of PAES comprises carboxylation and sulfonation, the process for preparing sulfonated polyarylethersulfone is mature at present, the prepared sulfonated polyarylethersulfone has various structures, but the IEC, the conductivity and the like of the sulfonated polyarylethersulfone are improved to a certain extent after the sulfonated polyarylethersulfone is simply sulfonated, but the mechanical properties of the sulfonated polyarylethersulfone are usually ceiling, so that the composite material is prepared by means of crosslinking modification, mixing modification and the like, and the previous step of stability and the like is realized.

Disclosure of Invention

The invention relates to a composite material of polyarylethersulfone, which is composed of the following segments of the structure:

I

II

wherein x/y =1, a =0-5000, b =0-5000, c =0-5000, d-0-5000.

Further, the invention provides a preparation method of the polyarylethersulfone composite material, which comprises the following steps:

1) 4,4' -dichlorodiphenyl sulfone reacts with fuming sulfuric acid to obtain 4,4' -dichlorodiphenyl sulfone-3, 3' -disodium disulfonate;

2) 4,4 '-dichlorodiphenyl sulfone-3, 3' -disodium disulfonate reacts with 4,4 '-dihydroxybiphenyl and 4,4' -dihydroxydiphenyl methane to obtain an intermediate product;

3) And blending and polymerizing the intermediate product and an acrylic monomer to prepare a composite material precursor, and then protonating to prepare the polyarylethersulfone composite material.

Specifically, the reaction conditions of step 1) are such that the molar ratio of 4,4' -dichlorodiphenyl sulfone to oleum is 2 to 6, wherein oleum is in SO ₃ Calculating; the reaction temperature is 120-130 ℃, and the reaction time is 15-24h.

More specifically, the step 1) also comprises the operation of adjusting the pH value by NaOH after the reaction is finished and salting out.

In addition, the reaction conditions in step 2) are preferably such that the molar ratio of 4,4 '-dichlorodiphenyl sulfone-3, 3' -disodium disulfonate, 4 '-dihydroxybiphenyl, 4' -dihydroxydiphenylmethane is 2.

Preferably, the specific steps of the step 3) are dissolving the intermediate product in an organic solvent, adding acrylic acid, an initiator BPO and a cross-linking agent N, N-methylene bisacrylamide, fully and uniformly stirring, paving on a glass plate, heating in an oven for full polymerization, then drying and forming, washing the formed product in ethanol after stripping, fully soaking in sulfuric acid in a water bath, finally washing with deionized water and drying to obtain the polyarylether sulfone composite material.

Preferably, the reaction conditions of step 3) are: the mass-to-volume ratio (g/ml) of the intermediate product to the acrylic monomer is 10: (1-10), preferably: 10: (4-7), more preferably 10:4.

preferably, it is characterized in that the reaction conditions of step 3) are: the mass-to-volume ratio (g/ml) of the crosslinking agent to the acrylic monomer is (1-10): 80, preferably: (2-7): 80, more preferably (5-6): 80.

has the beneficial effects that:

the novel polyarylethersulfone composite material has the advantages of simple preparation process and super-good water absorption and hydrolysis stability, and has high use value.

Detailed Description

The following detailed description of the present invention is provided to illustrate and explain the present invention and should not be taken as limiting the scope of the present invention.

Example 1:

1) Synthesis of disodium 4,4 '-dichlorodiphenyl sulfone-3, 3' -disulfonate

Referring to the literature procedure, oleum and 4,4' -dichlorodiphenyl sulfone were added to a 250mL reaction flask and their molar ratios were controlled (oleum as SO) ₃ And (4) calculating) as 3.

2) Preparation of intermediate products

Selecting a dry three-mouth bottle with a nitrogen displacement device and a water separator, dissolving 10mmol of prepared 4,4 '-dichlorodiphenyl sulfone-3, 3' -disodium disulfonate into a mixed solution of 30mL of DMSO and 30mL of toluene under the protection of nitrogen, then adding 5mmol of 4,4 '-dihydroxybiphenyl, 5mmol of 4,4' -dihydroxydiphenyl methane and 12.5mmol of potassium carbonate, heating to 140 ℃ for reaction for 4 hours, removing water generated by polycondensation in the form of a toluene-water azeotrope, heating to 160 ℃ for continuous reaction for 6 hours, pouring the reaction liquid into ice water after the reaction is finished to separate out a target product, filtering, repeatedly washing with deionized water, and drying to obtain an intermediate product.

3) Composite material for preparing polyarylethersulfone

Dissolving 1g of the intermediate product in a proper amount of dimethylacetamide DMA, cooling to 0 ℃, then adding 1mL of acrylic acid, fully stirring, adding 0.02g of initiator benzoyl peroxide BPO and 0.05g of N, N-methylene bisacrylamide at 0 ℃, fully stirring uniformly, then filtering to remove insoluble substances, paving on a glass plate, heating in an oven to 60 ℃, keeping for 24 hours for full polymerization, then drying and forming, stripping after forming, washing in ethanol, fully soaking in sulfuric acid in a water bath, finally washing with deionized water and drying to obtain the polyarylether sulfone composite material, namely the cross-linked polypropylene composite sulfonated polyarylether sulfone.

The structural formula of the obtained composite material is as follows, and the composite material is composed of a part I and a part II together to form an interpenetrating network structure:

Ⅰ

Ⅱ

wherein x/y =1, a =0-5000, b =0-5000, c =0-5000, d-0-5000.

Examples 2 to 10:

after the composite material with interpenetrating networks is prepared, the IEC, the water absorption rate and the mechanical property of the material are greatly influenced, but in consideration of the composition and the practical application of the material, the lower the proportion of the part II in the composite material is, the more difficult the properties such as the original IEC of the polyarylethersulfone material are theoretically changed. Therefore, a single-factor test is designed to investigate the relationship between the water absorption rate and the mechanical property and the proportion of the I part and the II part.

The preparation process of the specific examples 2-10 is identical to that of the specific example 1, and the only difference is that in the step 3), the amounts of acrylic acid are adjusted to 0.1mL,0.2mL,0.3 mL,0.4 mL,0.5 mL,0.6 mL,0.7 mL,0.8 mL and 0.9 mL respectively, and the amounts of the corresponding initiator and the cross-linking agent are also adjusted in the same proportion, so as to prepare the composite materials of the polyarylethersulfones of the examples 2-10 respectively.

Experimental example 1 Water absorption test

The water absorption rate is tested by measuring the mass after sufficient water absorption at a specific temperature and the dry mass before water absorption, and the specific test method is that a certain amount of water is selected and dried for 10 hours at 70 ℃, the mass W0 is measured, then the water absorption rate is tested by placing the water absorption rate in pure water to naturally swell for 24 hours, and the mass W1 is tested, wherein the water absorption rate is = (W1-W0)/W0 multiplied by 100 percent. Theoretically, for proton exchange in a fuel cell, the better the water absorption, which means the higher the proton conductivity. The water absorption is shown in Table 1.

TABLE 1

The results in the table show that the water absorption after addition of polymerized acrylic acid is initially not effective, probably due to the addition of polyacrylic acid which increases the basic mass but does not form a good network interpenetration structure; the water absorption rate is gradually increased, and a three-dimensional network structure can be completely formed, so that water molecules are easy to lock; when the amount of acrylic acid is further increased, it is mainly caused by the excessive mass of the acrylic acid as a base, or by the adhesion between the cross-linked polymerized acrylic acids, which occupies the space of water molecules. Since examples 5 to 9 are not so different in effect in water absorption, the mass-to-volume ratio of example 5 is preferred in consideration of IEC, proton amount on sulfonic acid group, and the like, and the subsequent experiments are carried out.

Example 11

Steps 1) and 2) are identical to example 1, and step 3) is:

dissolving 1g of intermediate product in a proper amount of Dimethylacetamide (DMA), cooling to 0 ℃, then adding 0.4mL of acrylic acid, fully stirring, adding 0.01g of initiator BPO and 0.02g of N, N-methylene bisacrylamide at 0 ℃, fully stirring uniformly, then filtering to remove insoluble substances, paving on a glass plate, heating in an oven to 60 ℃, keeping for 24 hours for full polymerization, then drying and forming, stripping after forming, washing in ethanol, fully soaking in sulfuric acid in a water bath, finally washing with deionized water and drying to obtain the polyarylether sulfone composite material.

Examples 12 to 17

The specific steps of the method are completely the same as those in example 11, except that the dosage of the crosslinking agent N, N-methylene bisacrylamide is respectively as follows: 0.005g,0.01g,0.015g,0.025g,0.03g,0.035g.

Experimental example 2 Water absorption test

The procedure for the water absorption test is described in example 1, and the results are shown in Table 2:

TABLE 2

From this, it is found that the water absorption rate tends to increase with an increase in the amount of the crosslinking agent, but the optimum value is around 5/80.

Experimental example 3: hydrolytic stability test

Hydrolytic stability, which may represent stability in extreme cases, was measured by placing a certain size in water at a temperature of 80 c, folding in half, measuring the time from the start of folding in half to the appearance of cracks on the outer surface of the fold, and testing each sample row three times, and the results are reported in table 3.

TABLE 3

Therefore, the mechanical property of the sulfonated polyarylethersulfone compounded by adding the crosslinked polyacrylic acid is obviously improved, wherein the performance is improved in a 'jump' manner along with the formation of a crosslinked grid. Therefore, the composite material has higher market value.

Claims

1. A composite of polyarylethersulfones consisting of segments of the structure:

I

II

wherein x/y =1, a =0-5000, b =0-5000, c =0-5000, d-0-5000;

the preparation method comprises the following steps:

1) Reacting 4,4' -dichlorodiphenyl sulfone with fuming sulfuric acid to obtain 4,4' -dichlorodiphenyl sulfone-3, 3' -disodium disulfonate;

3) Blending and polymerizing the intermediate product and an acrylic monomer to prepare a composite material precursor, and then protonating to prepare the polyarylethersulfone composite material;

dissolving the intermediate product in an organic solvent, adding acrylic acid, an initiator BPO and a cross-linking agent N, N-methylene bisacrylamide, fully and uniformly stirring, paving on a glass plate, heating in an oven for full polymerization, drying for forming, peeling the formed film, washing in ethanol, fully soaking in sulfuric acid in a water bath, washing with deionized water, and drying to obtain the polyarylethersulfone composite material.

2. The method for preparing a polyarylethersulfone composite material according to claim 1, comprising the steps of:

3. The process according to claim 2, wherein the reaction conditions in step 1) are such that the molar ratio of 4,4' -dichlorodiphenyl sulfone to oleum, in terms of SO, is from 2 to 6 ₃ Calculating; the reaction temperature is 120-130 ℃, and the reaction time is 15-24h.

4. The method of claim 2, wherein the step 1) further comprises adjusting the pH with NaOH after the reaction is completed, and performing salting-out.

5. The method according to claim 2, wherein the reaction conditions in step 2) are a molar ratio of disodium 4,4 '-dichlorodiphenyl sulfone-3, 3' -disulfonate to 4,4 '-dihydroxybiphenyl to 4,4' -dihydroxydiphenyl methane of 2.

6. The preparation method of claim 2, wherein the step 3) comprises the specific steps of dissolving the intermediate product in an organic solvent, adding acrylic acid, an initiator BPO and a cross-linking agent N, N-methylene bisacrylamide, stirring uniformly and sufficiently, laying the mixture on a glass plate, heating the mixture in an oven to sufficiently polymerize, drying and forming, stripping the formed membrane, washing the stripped membrane in ethanol, soaking the membrane in sulfuric acid in a water bath, washing the membrane in deionized water, and drying the membrane to obtain the polyarylethersulfone composite material.

7. The method according to claim 6, wherein the reaction conditions in step 3) are: the mass volume ratio g/ml of the intermediate product to the acrylic monomer is 10: (1-10).

8. The method according to claim 6, wherein the reaction conditions in step 3) are: the mass volume ratio g/ml of the intermediate product and the acrylic acid monomer is 10: (4-7).

9. The method according to claim 6, wherein the reaction conditions in step 3) are: the mass volume ratio g/ml of the intermediate product to the acrylic monomer is 10:4.

10. the method according to claim 6, wherein the reaction conditions in step 3) are: the mass volume ratio g/ml of the cross-linking agent and the acrylic monomer is (1-10): 80.

11. the method according to claim 6, wherein the reaction conditions in step 3) are: the mass volume ratio g/ml of the cross-linking agent and the acrylic monomer is (2-7): 80.

12. the method according to claim 6, wherein the reaction conditions in step 3) are: the mass volume ratio g/ml of the cross-linking agent and the acrylic acid monomer is (5-6): 80.